RECENT ADVANCES IN SCIENCE 551 



found a suite of rocks belonging to the spilitic series (Geol. 

 Mag. 191 8, 483-9). This observation tips the balance of 

 evidence definitely against Suess' interpretation of the structure 

 of this island as part of a great eastwardly-directed loop, 

 homologous with the Antilles, connecting the Patagonian 

 Andes with the mountains of Graham Land. The continued 

 absence of andesites in collections from the island, and the 

 presence of a spilitic suite, favours rather the interpretation 

 that South Georgia and the South Orkneys are remnants of 

 a continental land which once occupied the South Atlantic. 



Foye, W. G., Notes on a Collection of Rocks from Honduras, 

 Central America, Journ. Geol. 191 8, 26, 524-31. 



Smith, H. G., The Basic Intrusions of Gelli Hill, Radnor- 

 shire, Geol. Mag. 191 8, 500-7. 



Although not geological in its aim, G. V. Wilson's paper 

 entitled " Notes on the Formation of Certain Rock-forming 

 Minerals in and about Glass Furnaces " (Trans. Soc. Glass 

 Tech. 191 8, 2, 177-216), contains material of much value to 

 geologists, especially in connection with the separation of 

 minerals such as wollastonite, augite, tridymite, quartz, and 

 cristobalite, from high temperature melts, and under con- 

 ditions approximating to those of contact metamorphism. 



A very notable contribution to metamorphic petrology, 

 worthy to be ranked with recent Scandinavian work, comes 

 from Australia (F. L. Stillwell, The Metamorphic Rocks of 

 Adelie Land, Section 1, Australian Antarctic Expedition, 

 1911-14, Sci. Repts., Ser. A, vol. iii. pt. 1, 191 8, pp. 230, 35 pis.). 

 The work concerns only the rocks collected in situ, and is a 

 necessary preliminary to the study of large collections of 

 morainic material, which are the only samples of the rocks 

 of the greater part of Adelie Land ever likely to be obtained. 

 At all localities save one there are found the metamorphic 

 equivalents of both acid and basic igneous rocks ; and it has 

 been established that the latter were originally dykes intruding 

 the granitic series and the associated sedimentary rocks. 



Many points of theoretical importance are dealt with in 

 this memoir. In some inclusions of amphibolite within 

 granodiorite-gneiss the boundaries between the rocks have 

 been destroyed and replaced by a gradual transition. This is 

 believed to have been caused by a process of metamorphic 

 diffusion of material across the pre-existing margins. 



